Cypress Semiconductor EZ-Host CY7C67300 User Manual download pdf (Page 68)

CY7C6730

PRELIMINARY

Document #: 38-08015 Rev. *D Page 68 of 120

VBUS Valid Flag (Bit 0)

The VBUS Valid Flag bit indicates whether OTG VBus is greater then 4.4V. After turning on VBUS, firmware should wait at least

10 µs before this reading this bit.

1: OTG VBus is greater then 4.4V

0: OTG VBus is less then 4.4V

Reserved

All reserved bits should bit written as ‘0’.

7.8 GPIO Registers

There are seven registers dedicated for GPIO operations. These seven registers are covered in this section and summarized in

Figure 7-46.

7.8.1 GPIO Control Register [0xC006] [R/W]

Figure 7-47. GPIO Control Register

The GPIO Control Register configures the GPIO pins for various interface options. It also controls the polarity of the GPIO interrupt

on IRQ1 (GPIO25) and IRQ0 (GPIO24).

Write Protect Enable (Bit 15)

The Write Protect Enable bit enables or disables the GPIO write protect. When Write Protect is enabled, the GPIO Mode Select

[10:8] field read-only until a chip reset.

1: Enable Write Protect

0: Disable Write Protect

UD (Bit 14)

The UD bit routes the Host/Device 1A Port’s transmitter enable status to GPIO[30]. This is for use with an external ESD protection

circuit when needed.

1: Route the signal to GPIO[30]

0: Do not route the signal to GPIO[30]

GPIO Control Register 0xC006 R/W

GPIO0 Output Data Register 0xC01E R/W

GPIO0 Input Data Register 0xC020 R

GPIO0 Direction Register 0xC022 R/W

GPIO1 Output Data Register 0xC024 R/W

GPIO1 Input Data Register 0xC026 R

GPIO1 Direction Register 0xC028 R/W

Figure 7-46. GPIO Registers

Bit # 15 14 13 12 11 10 9 8

Field Write Protect

Enable

Reserved

SAS

Enable

Mode

Select

Read/Write R/W R/W - - R/W R/W R/W R/W

Default 0 0 0 0 0 0 0 0

Bit # 7 6 5 4 3 2 1 0

Field HSS

Enable

HSS XD

Enable

SPI

Enable

SPI XD

Enable

Interrupt 1

Polarity Select

Interrupt 1

Enable

Interrupt 0

Polarity Select

Interrupt 0

Enable

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Default 0 0 0 0 0 0 0 0

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 119 120

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Cypress Semiconductor EZ-Host CY7C67300 User Manual Page 68

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